For service and parts needs, visit your dealer. You will receive genuine GM parts and GM-trained and supported service people.
Genuine GM parts have one of these marks:

Vehicle Care
California Proposition 65 WarningFront Fog Lamp Bulb Replacement
Preliminary Procedures
Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle
Disconnect the forward lamp electrical harness connector from the fog
lamp bulb socket.
Remove the Front Bumper Fascia Opening Lower Cover. Refer to Front
Bumper Fascia Opening Lowe ...
Front Side Door Weatherstrip Replacement - Body Side
Front Side Door Weatherstrip - Body Side
Procedure
Start at the rear upper corner of the door opening and pull the
weatherstrip away from the door opening flange.
Position the weatherstrip in the upper corner of the center pillar.
Working downward along the front edge, in ...
Roof Side Rail Inflatable Restraint Module Replacement
Warning: In order to prevent SIR deployment, personal injury, or
unnecessary SIR system repairs, do not strike the door or the
door pillar in the area of the side impact sensor (SIS). Turn OFF the ignition
and remove the key when performing service in the
area of the SIS.
Warning: When pe ...